The IBM System/390 computer line introduced in late 1990 that used 31-bit addressing with maximum memory capacities from 256MB to 9GB. Its 18 models (Model 120 to Model 960) offered the widest range of power in a single introduction at one time with prices ranging from $70K to $23M. Vector processing was optional on high-end water-cooled and certain air-cooled models. See System/390.